CHIMAERA Half Ball Balance Yoga Trainer with Resistance Bands and Air Pump Fitness Exercise This versatile and clever device will help improve your balance, enhance your flexibility, and it will help you burn those extra calories! Dome side up, it offers a more dynamic surface, while providing a more stable device Size: Ball Diameter 22.8"; Ball height 9" Includes air pump and resistance bands Maximum weight limit: 660 lbs.